I got this suggestion from a user I recently trained. If you want changes to the Master Estimate(s) to be documented and tracked, create a Word document and each time a revision is made summarize (or detail) the revision. Attach it in the Setup>Estimate Information screen as a document. It will be copied into every estimate so the current estimate will have the last documented revision from which that estimate was created.

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It is important as you revise the document that you call it up from HeavyBid as if it is attached it is actually in the Master Estimate directory as a copied document.